Now, grinding compound degree of hardness multipurpose microhardnessexpression. The microhardness is one kind presses in degree ofhardness, reflected was measured the object resists the ability whichanother hard object presses in. The survey instrument is the microsclerometer, it is in fact is equipped with andLoad  the installmentto have the ocular micrometer the microscope. Before determination,first must treat measured the grinding compound makes the reflection mo pian test specimen, sets carries on thing to the micro sclerometer,ya tou pressurizes through and Load the installment to four ling cone-shapes diamonds. The load size may act according to treatsmeasured the material degree of hardness different fluctuates. Afterthe diamond ya tou presses in the test specimen, produces a pit on thetest specimen surface. Aims at the pit the microscope cross silk,surveys the pit opposite angle line length with the ocular micrometer.

May calculate according to and loadand the pit opposite angle linelength measures material the microhardness value. Because uses thediamond ya tou shape to be different, the microhardness divides intoUygur (Vickers) the microhardness in lu pu (Knoop) the microhardnessfour kinds. The Uygur microhardness is with the object for 130° thediamond four ling zhui does presses ru tou, its value presses down thetype computation: HV = 18.18Pd2 variety Uygur's microhardness /Mpa(kg/mm2) brown just jade 19 600~21 600 (2 000~2 200) Bai Gangyu 21600~2 600 (2 200~2 300) the chromium just jade 21 600~22 600 (2 200~2300) the unit crystal just jade 21 600~23 500 (2 200~2 400) themicrite just jade 19 600~21 600 (2 000~2 200) the alumina agglutinatedjust the jade 16 700 (1 700) the zirconium just the jade 14 700 (1500) the diamond 78 500 (8 000) the boron carbide 49 000 (5 000)silicon carbide 30 400~3 330 (3 100~3 400) the garnet 13 300 (1,360)the quartz 8 000 (820 ) In the formula: HV - vickers hardness, Mpa; P- load capacity, kg; D - pit opposite angle line length, mm. nu pudegree of hardness is with to the edges and corners for 170°30 ' and130° the diamond four ling zhui does presses lu tou, its value pressesdown the type computation: HK=139.54 P/L2. In the formula: HK - nu tou degree of hardness, Mpa; P - load capacity, kg; L - pit opposite angleline length, mm. Our country and the European various countries usesvickers hardness, US uses nu pu degree of hardness. The megabar (MPa)is the microhardness legal measuring unit, but kg/mm2 was the beforecommonly used degree of hardness unit of measurement. Between them thereduction formula is 1kg/mm2=9.80665Mpa. The commonly used grindingcompound microhardness sees the next table. The transportation andcertainly for avoids rubbing has in the transportation and the storageprocess suffers injury, must pay attention: The long-distancetransport needs to use the wooden crate or the wicker basket stripproperly packs, and so on the soft nature will rub with the straw andthe sawdust has separates, prevents the collision and the impact. Theceramics rub have cannot put on the place which is moist or freezes,xiang jiao mo cannot with the oil contact, the resin rub has can with thealkali contact, otherwise can reduce rubs has the intensity and rubstruncates the strength.

Rubs has should deposit in the dry place, the room temperature is notlower than 5 degree Celsius. Rubs has should separate the laying asideaccording to the specification, the depository is equipped with thesymbol, in order to avoid has chaotic and the mistake, the layingaside method should regard rubs truncates the shape size to decide.The diameter big or thicker rubs has should stand erect with slightlyinclines places, thinner and a smaller grinding wheel should evenlyfold places, but not suitable excessively is high, and its underrespectively puts a smooth sheet iron in above, prevented the grindingwheel distorts or bursts. Organically rubs has the storage time notsuitably to surpass for a year. The ultra time rubs has, before theuse should carry on the strength test. After changes the system theafter grinding wheel also to be supposed reto carry on rear area theturning trial to be able to use. Installs the grinding wheel to besupposed to pay attention to following several aspects: Before thegrinding wheel installment, must proofread its safe speed. The symbolis unclear or non- symbolizes the grinding wheel, must repass throughthe turning trial. Before the installment, must use the wooden hammerto tap the grinding wheel. If discovered has the mute sound, explainedin the grinding wheel possibly has the crack, cannot use. Clamps inthe grinding wheel two side flange plate, its shape, the size, must besame. The flange plate diameter for the grinding wheel diameter onehalf, the inside request has the scoop channel. Between the grindingwheel end surface and the flange plate, must fill up thicknessapproximately is together the 1~2mm elastic cardboard or Pi Cao, theoil resistant rubber gasket, the filling piece diameter slightly isbigger than the flange plate the outer diameter. Should symmetricallyscrew tight the flange plate bolt in turn, causes to clamp thestrength distribution to be even. But makes an effort not to besuitable oversized, in order to avoid compression fracture grindingwheel. After the grinding wheel installs, at least must pass throughtime jing pieng heng can install on the grinder. Below rubs truncates whenthe safe operation rubs truncates when should pay attention to theitem: Front drives must carefully inspect each operation handle or thebutton whether in correct position, grinder each kind of movement iswhether normal. Before the new grinding wheel use, must first idleoperation 5min. After the confirmation revolution is normal, firstrepairs smoothly the grinding wheel outer annulus and two endsurfaces, then dismounts together together with the flange plate, thencarries on time jing ping heng. In the grinding wheel generating process,the operator should not stand in the grinding wheel rotation planedirection. Front rubs truncates must carefully inspect is rubbed thework piece attire to clamp whether correctly, fastens whetherreliably, specially should pay attention adjusts keeps off the blockposition, and fastens, the attention prevents the grinding wheelcollision cartridge, ka pan or tailstock. Rubs when truncates, shouldin the work piece and the grinding wheel all occupies under thenoramal work condition again jin dao (jin dao not to have to be fierce);Similarly, must after draw back the knife to be able to stop. Cannot atwo person of concurrent operations grinder. The operator does nothave to depend in the grinder, in order to avoid has the accident.When the work piece still at revolves, cannot carry on the survey,prohibited touches the grinding wheel with the hand or cleans with thecotton and kapok granulated substance is rotating the work piece. Theoperator should put on the good-fitting work clothes, wears themouthpiece, in order to avoid the inspiration dust and rubs truncatesthe fluid fog bead. The female worker should wear the work hat, whenthe truing of grinding wheel should wear protects the eyeglasses, inorder to avoid the detritus flies into in the eye. Front stops shouldfirst shut off for the fluid system, and lets grinding wheel idleoperation 1 - 2min, throws off in the grinding wheel to adsorb rubstruncates the fluid.